An Iraqi special forces sergeant watches the front line with Islamic State group fighters inside the Mamun neighborhood of western Mosul, Iraq, Thursday March 2, 2017. While Iraqi forces have retaken a handful of neighborhoods on Mosul's southwestern edge, IS fighters continued to launch fierce counterattacks on Iraqi positions inside Mosul. (Photo by Susannah George/AP Photo)

Iraqis holding white flags walk down a road as they flee Mosul on March 1, 2017, during an offensive by security forces to retake the western parts of the city from Islamic State (IS) group fighters. At least 26,000 people have fled in the 10 days since Iraqi forces launched the push to retake west Mosul, where jihadists put up “fierce” resistance. (Photo by Aris Messinis/AFP Photo)

A member of the Hashed al-Shaabi (Popular Mobilisation) paramilitaries, walks next to a sinkhole, known as the Khasfah (an Arabic word for a crack or a hole that opens up in the ground), in the village of Athbah, south of Mosul on February 26, 2017. (Photo by Aris Messinis/AFP Photo)

A member of Iraqi security forces inspects the body of a displaced woman killed in the clashes, during the battle against Islamic State militants, at the district of al-Mamoun in Mosul, Iraq, March 1, 2017. (Photo by Alaa Al-Marjani/Reuters)

Displaced Iraqis flee their homes in Mamoun district as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 1, 2017. (Photo by Zohra Bensemra/Reuters)

An Iraqi special forces soldier fires as other soldiers runs across a street during a battle in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

A woman gestures as she approaches Iraqi special forces soldiers during a battle in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

A woman walks with an Iraqi special forces soldier after she crossed from Islamic State controlled part of Mosul to Iraqi troops controlled part of Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

Iraqi women and children sit after they crossed from Islamic State fighters controlled part of Mosul to Iraqi troops controlled part of Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier runs for cover during a battle with Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

Iraqi special forces soldiers stand in a house during a battle with Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier smokes as he takes a break during a battle between Iraqi special forces soldiers and Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces member takes a rest inside a house during a battle with Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier searches a house during a battle with Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

Iraqi special forces soldiers search a house during a battle with Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier searches a house during a battle with Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier runs for cover as he fires his rifle during a battle with Islamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier carries a handmade gun captured from slamic State militants in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier fires a rifle as other soldiers runs across a street during a battle in Mosul, Iraq March 1, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier throws a hand grenade during a battle with Islamic State militants in Mosul, Iraq March 2, 2017. (Photo by Goran Tomasevic/Reuters)

Iraqi special forces soldiers run during a battle with Islamic State militants in Mosul, Iraq March 2, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi Army officer (R) uses his mobile phone to film a rocket launched towards Islamic State militants during a battle with Islamic State militants in Mosul,Iraq March 3, 2017. (Photo by Alaa Al-Marjani/Reuters)

Iraqi special forces soldiers run inside a house during a battle with Islamic State militants in Mosul, Iraq March 3, 2017. (Photo by Goran Tomasevic/Reuters)

An Iraqi special forces soldier reacts after Islamic State militants shot dead another Iraqi special forces soldier during a battle in Mosul, Iraq March 3, 2017. (Photo by Goran Tomasevic/Reuters)

A donkey spraypainted with “Daesh”, the Arabic acronym for the Islamic State group, stands on a hill outside Mosul on March 2, 2017, during an offensive by security forces to retake the western parts of the city from Islamic State (IS) group fighters. (Photo by Aris Messinis/AFP Photo)

Iraqis carry belongings as they flee Mosul on March 1, 2017, during an offensive by security forces to retake the western parts of the city from Islamic State (IS) group fighters. At least 26,000 people have fled in the 10 days since Iraqi forces launched the push to retake west Mosul, where jihadists put up “fierce” resistance. (Photo by Aris Messinis/AFP Photo)

An Iraqi special forces soldier shot dead an Islamic State suicide bomber in Mosul, Iraq March 3, 2017. (Photo by Goran Tomasevic/Reuters)

In this Tuesday, February 21, 2017 photo, Iraqi security forces drag a suspected IS fighter down a spiral staircase after raiding his house in the liberated eastern part of Mosul. The suspects are identified via intelligence gathered from information received from other civilians in the city. (Photo by John Beck/AP Photo)

Iraqi troops advance towards Mosul's on February 24, 2017 during an ongoing offensive to retake the northern city from jihadists of the Islamic State group
Iraqi forces entered west Mosul neighbourhoods, a key stronghold in the shrinking “caliphate” of the Islamic State group, which replied with deadly suicide attacks in Iraq and Syria. The elite Counter-Terrorism Service that did most of the fighting in the four-month-old Mosul offensive entered a neighbourhood further west along the city's southern limits. (Photo by Aris Messinis/AFP Photo)

Members of Iraq's elite Rapid Response Division carry a wounded comrade in the northern city of Mosul, as Iraqi forces continue the offensive to retake the city's western half from Islamic State (IS) group fighters, on February 25, 2017. (Photo by Aris Messinis/AFP Photo)

A member of the Iraqi forces aims his weapon as troops advance through Mosul's Jawasaq neighbourhood on February 27, 2017, during an offensive to retake the area from Islamic State (IS) group fighters. Iraqi forces battling the Islamic State group in west Mosul reached the city's southernmost bridge, a key step in efforts to defeat the jihadists in their stronghold, a spokesman said. (Photo by Ahmad Al-Rubaye/AFP Photo)

Members of the Iraqi army's 9th Division hold a position on a hill in Talul al-Atshana, on the southwestern outskirts of Mosul, on February 27, 2017, during an offensive to retake the city from Islamic State (IS) group fighters. (Photo by Aris Messinis/AFP Photo)

Members of the Iraqi army's 9th Division fire a multiple rocket launcher from a hill in Talul al-Atshana, on the southwestern outskirts of Mosul, on February 27, 2017, during an offensive to retake the city from Islamic State (IS) group fighters. (Photo by Aris Messinis/AFP Photo)

A member of the Iraqi federal police reacts following an explosion in Mosul on February 26, 2017 during an operation by Iraqi forces to retake the city from Islamic State (IS) group fighters. (Photo by Aris Messinis/AFP Photo)

Displaced Iraqis from the Dindan neighborhood in the western half of the northern city of Mosul, are seen as they flee towards the Hammam al-Alil area, on February 26, 2017 during the offensive to retake the area from Islamic State (IS) group fighters. (Photo by Ahmad Al-Rubaye/AFP Photo)

Iraqi security forces check the men boys among hundreds of people fleeing clashes between Iraqi forces and Islamic State group militants in western Mosul on Thursday, March 2, 2017. The United Nations says 28,400 people have fled the city since the operation to retake its remaining militant-held western districts was launched last month. (Photo by Susannah George/AP Photo)

Displaced Iraqis, who fled fighting between Iraqi security forces and Islamic State militants, line up to receive food, at a camp for internally displaced people, in Hamam al-Alil, some 10 kilometers south of Mosul, Iraq, Thursday, March 2, 2017. (Photo by Khalid Mohammed/AP Photo)

An Iraqi special forces soldier fires a sniper rifle during a battle with Islamic State militants in Mosul, Iraq March 2, 2017. (Photo by Goran Tomasevic/Reuters)

A man injured in a mortar attack is treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A woman injured in a mortar attack is treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A boy injured in a mortar attack is treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A man injured in a mortar attack is treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A boy injured in a mortar attack walks toward an ambulance after being treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A displaced woman lies down at a field hospital beneath a billboard erected by Islamic State's militants. The billboard reads, “There is No God Only God. Islamic State Nineveh Governorate”, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A man injured in a mortar attack walks toward a ambulance after being treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A woman injured in a mortar attack is treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A woman injured in a mortar attack walks toward a ambulance after she was treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

A boy injured in a mortar attack is treated by medics in a field clinic as Iraqi forces battle with Islamic State militants, in western Mosul, Iraq March 2, 2017. (Photo by Zohra Bensemra/Reuters)

Displaced Iraqi young woman looks towards the camera as she gathers with others to flee the city of Mosul while Iraqi forces battle against Islamic State (IS) group jihadists to recapture the west of the city on February 28, 2017. Hundreds of civilians fled through the desert to escape fighting and privation in Mosul, joining thousands of others who left their homes as conditions worsen in the city's west. (Photo by Aris Messinis/AFP Photo)